Dvd media that is used for movies is usually pressed on what is called dvd9, or dual layered. The blank media used in dvd burners is dvd5. Naturally a movie won't fit onto one disc. There are several pregrams you can use to burn the dvd. The best program is called
dvdxcopy. This program allows you to keep true dvd quality. It also has a feature that when burning a damaged disc in a way repairs it.(sounds like you might need this) This program allows you to remove any extra features you might not wan't or care to have. Since most movies are dvd9, this requires splitting to two dvds. But by removing extras, the film might fit onto one disc. Another program is called dvd2one. This program will lower the quality of the movie to allow it to fit onto one disc. I personally use dvdxcopy to keep dvd quality and don't mind using a second $1 disc to fit the movie on. But if you would rather lose quality and use only one disc, use dvd2one. Hope this helps.